Rewrite std::string("") to std::string(), Linux edition.

chrome/browser/history/history_querying_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 450 matching lines @@
   EXPECT_EQ(1, results.urls().size());
   EXPECT_TRUE(NthResultIs(results, 0, 4));
 }
 */
 
 // Test iterating over pages of results.
 TEST_F(HistoryQueryTest, Paging) {
   // Since results are fetched 1 and 2 at a time, entry #0 and #6 will not
   // be de-duplicated.
   int expected_results[] = { 4, 2, 3, 1, 7, 6, 5, 0 };
-  TestPaging("", expected_results, arraysize(expected_results));
+  TestPaging(std::string(), expected_results, arraysize(expected_results));
 }
 
 TEST_F(HistoryQueryTest, FTSPaging) {
   // Since results are fetched 1 and 2 at a time, entry #0 and #6 will not
   // be de-duplicated. Entry #4 does not contain the text "title", so it
   // shouldn't appear.
   int expected_results[] = { 2, 3, 1, 7, 6, 5 };
   TestPaging("title", expected_results, arraysize(expected_results));
 }
 
 }  // namespace history